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All Journal Jurnal Kesehatan Gigi Indonesian Journal of Chemistry JMM (Jurnal Masyarakat Mandiri) Interdental Jurnal Kedokteran Gigi (IJKG) Journal of Renewable Energy, Electrical, and Computer Engineering Jurnal Teknik Kimia dan Lingkungan Journal of Engineering and Technological Sciences
Ernawati, Kadek Lusi
Bagian Konservasi Gigi, Fakultas Kedokteran Gigi, Universitas Mahasaraswati Denpasar
Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Dentistry Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Medicine & Pharmacology Public Health Other

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Journal : Indonesian Journal of Chemistry

 1 
Enhanced Optical Properties of ZnO-TiO2 Films Through Co-Sensitization with Multiple Natural Dyes Musyarofah, Musyarofah; Nuraini, Inas; Prayitno, Budi; Ernawati, Lusi; Ismail, Andi Idhil; Triwikantoro, Triwikantoro
Indonesian Journal of Chemistry Vol 25, No 1 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.96154

Abstract

The ZnO-TiO2 films were co-sensitized with single, double, and triple natural dyes, leading to distinct effects on the optical properties. ZnO (wurtzite) and TiO2 (anatase) were prepared from commercial powders and the XRD results revealed that the crystallite size is 158 and 443 nm, respectively. The UV absorbance of ZnO powder shows significant peaks at wavelengths of 255 and 345 nm, with a band gap energy of 3.07 eV. Meanwhile, TiO2 powder exhibits a maximum peak at 325 nm and possesses a band gap energy of 3.16 eV. The extraction of natural dyes (Moringa oleifera, Biancaea sappan, Matricaria chamomilla, Rosa, and Chrysanthemum) was carried out using a cost-effective and simple method involving immersion in ethanol for 2 × 24 h followed by filtration. FTIR test results show the presence of O–H, C–H, C=C, and C–O functional groups. The results of coating the ZnO-TiO2 film with natural dyes show that the UV spectrum peaks are higher than the visible light wavelength. Co-sensitization of double natural dyes demonstrated different effects on the ZnO-TiO2 film, i.e., achieved panchromatic absorption mainly in the UV wavelength spectrum.
Characterization of Zn-Doped MgTiO3 Powders Synthesized by Dissolved Metals Mixing Method Musyarofah, Musyarofah; Tanaka, Isao; Mohamed, Zakiah; Poo-arporn, Yingyot; Ernawati, Lusi; Yudoyono, Gatut; Prayitno, Budi
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.95879

Abstract

Zn-doped magnesium titanate powders with different Zn compositions, x = 0 to 1, were synthesized using the dissolved metals mixing method. The roles of calcination temperature and dopant Zn composition on powder morphology, phase composition, crystallite size, crystalline cell volume, and local environment were investigated through scanning electron microscope (SEM) observation, Rietveld analysis of powder X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and X-ray absorption spectroscopy (XAS) for Ti K-edge X-ray absorption near edge structures (XANES). We found that the geikielite solid solutions were formed during the pre-calcination at 400 °C for 1 h. Results show spherical particles (~1 µm) with minimal size variation across calcination temperatures (600–800 °C) and Zn compositions, though some agglomeration occurs. After calcination at 600 °C for 4 h, the crystalline cell volume of geikielite was proportional to the Zn composition, implying the formation of the solid solution in the range of Zn composition up to the level close to x = 1. This successful synthesis of the Zn-doped magnesium titanate nanocrystals at temperatures much lower than those required by the solid-state reaction method was thereby well demonstrated.
Co-Authors A.A.A. Hartini Anifah, Eka Masrifatus Apip Amrullah Ari Astuti Budi Prayitno Dewa Made Wedagama Diyah Fatmasari Gatut Yudoyono Hariyadi, Asful Hartini, I G A A Idhil Ismail, Andi Izzulhaq, Muhammad Ghozy Joko Waluyo Kurnia, Irwan Kurniawati, Diniar Mungil Laksono, Andromeda Dwi Lestari, Rizka Maharsih, Inggit Kresna Maryanti, Desy Maulidah, Istiana Mohamed, Zakiah Musyarofah Musyarofah, Musyarofah Nabila, Zahrani Putri Novi Sylvia Nuraini, Inas Obie Farobie Payungalo, Juwita Poo-arporn, Yingyot Prawisudha, Pandji Purba, Ibnu Tryansar Pusfitasari, Memik Dian Putra, Ariadi Indra Putri, Nita Ariestiana Raihan, Muhammad Reza, Mutia Rizka Ayu Yuniar Rizqy Romadhona Ginting Sapawe, Norzahir Sari, Thalia Winda Septian, Ardie Sianturi, Hizkia Gunawan Parulian Sumantri Sumantri Tanaka, Isao Triwikantoro Triwikantoro Wardhani, Ranti Kusuma Wedagama Wedagama